兩個矩形不斷作變化
package com.example.mysurfacetest;
import ....
public class MainActivity extends Activity {
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
//將主程式畫面設給繼承SurfaceView的自建內部類別 setContentView(new MySurface(this)); }
//自建內部類別必須繼承SurfaceView以及實作SurfaceHolder.Callback
//並實作其抽象Callback方法 public class MySurface extends SurfaceView implements SurfaceHolder.Callback {
//建立以及宣告Handler來管理以及調派執行緒 final private Handler handler = new Handler();
//宣告SurfaceHolder，之後用來取得Canvas物件 SurfaceHolder holder; boolean flag;
//宣告畫筆變數以及建立物件 Paint mPaint = new Paint();
//建構式 public MySurface(CoNtext coNtext) { super(coNtext); // TODO Auto-generated constructor stub
//取得SurfaceHolder物件 holder = this.getHolder();
//addCallback()設定callback函式 holder.addCallback(this); flag = true; }
//繪圖的工作在自建執行緒t中執行 Thread t = new Thread(new Runnable() {
public void run() { // TODO Auto-generated method stub drawPicture(); }
});
//Callback public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub }
//Callback public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub
//啟動執行緒 t.start(); }
//Callback public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub handler.removeCallbacks(t); }
protected void drawPicture() { // TODO Auto-generated method stub
// Bitmap bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher);
//鎖定畫布，並利用SurfaceHolder取得canvas物件 Canvas c = holder.lockCanvas(); if (flag) { mPaint.setColor(Color.RED); // c.drawBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), null);
//用Canvas繪圖
//RectF(原點X軸,原點Y軸,寬,高) c.drawRect(new RectF(0, 100, 1200, 600), mPaint); flag = false; } else { mPaint.setColor(Color.BLUE); c.drawRect(new RectF(380, 380, 760, 760), mPaint); flag = true; }
//解鎖畫布 holder.unlockCanvasAndPost(c);
//執行緒t暫停1秒後再跑一次 handler.postDelayed(t, 1000);
}
} }
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